Improvement in elevators



AMHA

l lui.

UNITED STATES PATENT OFFICE.

y LEWIS wEiTLooK, vor BROOKLYN, NEWYORK.

` '|MPRQVEMENT IN ELEvAToRs.

Specification forming part of L etterslatent N9. 158,613, dated January12, 1875; application tiled v v December 27, 1873. i I

To Vallfwhom tima-y concern Bc 1t knownthat LLEWIS `L..WE.1TLOCK,

'of Brooklyn, in the county ot' Kings and State of New-York, haveinvented certain new and useiul Improvements in Devices forltais'ingWeights, &c.; and I do'. hereby declarethe following ltobc a full,clear, and exact description of lthe invention, suclr` aswill i enableothers skilled in thelartto which itpertains to make 'andusejinreference being had to the accompanying drawings, which forni part ofthis specification.

M y' "nvention relates to an improvement inl gzeviees for raisingweights, such as elevators, Ln the drawings, Figure 1 showsia generalview, in side clevatiomol myvinven'tiui'i. Fig;

and combinations, as hereinafter specified and claimed, wherein Eis'airictionlpinion, to whose shaft is applied the motive'pop'er.4 El is itsbalance-w heel. lis a rocker-box', swinging upo n apivot, t, `1n whichis journaled said friction-pinion E and its balance-wheel El. The

shaft iyof the friction-pinion E is soplaeed in' relation to `thepivote' ofthe rocker-box I that the center ot"gravity`of the wheels E Elshall fall sutiiciently beyond the pivot 1", that when the pressure ofthe lever F is removed the friction-pulleys A E will be disengagedautomatically by the weight of the wheels E E, operating the rocker-boxl. A" is a drum or bullvvheel-attached to and operated with the fric,tion-wheel A, upon which is wound the lifting-line a. Fis alinktransmitting motion between the rocker-box 1.0i' the friction-pinion lland the lever F', fulcrulned at f, and operated by the line G. D is alever, fulerumed at d', provided with the adjust-ableweight D,

friction-brake D1, and eccentric d, said frictionbrake Dl and eccentricd engaging withthe friction-wheel A. G is a lin'e, or its equivalent,for operating the friction-brake D. The weight D2 automatically operatesthe eccent-ric d, as will hereinafter appear. To the lift-A ing-line aisattached vthe weight X, which,.in

the drawings, is represented as a car. Said line a passes through thetop X of the car X,

theny through the spring It, which may be otrubher or other fsui'tablematerial, and then through the arms b' of the eccentricsb,`and isfastened tothe arms b in a suitable manner. l

The arms b serve as weights to the eccentrics b. These eccentrics areconnected by the link c and the idle-rollers c. B B arebars, rods, orVtheir equivalents, passing betweenthe eccen- Vtries b b and theidle-rollerst".` The rods B BA are secured at each ,end to the buildingrorsuitable frame, as indicated at B. Upon. the car X is attached mydevice for operating the lifting mechanism. I do not limit myself toplacingsaid device Within or upon the car, as it may be separatelyplaced upon any or all of the A several stories or floors of a building,or in any suitable'place olitside the car.A4 R is a disk or lever,operated by the handle R', which serves as a crank to the cog-wheel r,which engages with the cog-lever S. f This lever is jonrnaled at 'l tothe bar t, at either end of which are attached the friction-pulleys t't. u .w are Vstationary friction-pnlleys` The-pulleys au are vxed oneabove another, in aline parallel to and upon'theinner side of the'line'G.; ,l

likewise the pulleys 'w jw-to the line G. The pulleys u u and tl and w wand t2 may be reversed in their order to the lines G G', The line Gr isarranged to pass |down between the pulleys 'w w and tzr; Said lines GGr' are fastened at their'lower extremities to the frame H. z is astop-piece placed in a suitable position upon the line G, lso-that theelevator will .be prevented from rising above the point at which ,it isxed by impinging .upon it, and operating to stop the ascensionof saidelevator. The friction-pinion E (sce Fig. 3) will be seen to be upon theprinciple of the conepulley, E2 heilig a smallerfriction-pinion than E.This cone friction-pinion is arranged to slide upon the shaft i', sothat either the pinion E orE2 may be thrown into gear with the wheelA,for the purpose of giving different velocitiesy to said wheel A.

The operation is as follows: Motive power is applied to the shaft i',moving the frictionpinion E and its balance-wheel El. The balance-wheelEl is made of suitable weight, and driven at such a velocityas to storein itself sufficient power to raise the weiglxtwithout materialassistmicefrom the motive force. The wheels E E are journaled and swungin therocker-box I, so pivoted at'f asfto' automatically disengage fromthe wheel A when not desired to be employed. When it is del aired tolift: the Weight: or car X, the frictionwheel A, with its; drum A1,operated by tension upon the line lGr, operates, through the`v lever F'and' the ilink F androcker-box I, to

stop d serres? an i additioxia. l" .1'n 1ifp0se inlholdf ing theelevatoratirstg:while tholever isat its neutral-poilitwlieiiling'meversed. Shouldthe lifting-line Vaj-.lirealqthe car or. weight X-wouldbenstplegl `iii".thegfollowing' way,- (see Fig.' 2 Tl1e, liftiu'gpressure being!'reliexfeill from the ends of fthe?'eccentriciarmsbg'said" arms 'of` then-Town Weight would fall, thereby opcratngjtheeccentrica b. It 4will be .seein that thefrods Bjwoulll thus be.powerfully. griped between-theeccentrica b and the idlerollers o',andlfidoxfwfnyi'ard*{notiomof the-eark or weight-Kobe'eectuallystoppei YWhat lelai as my' invention iSf 1. The-combination of the frictionliftingi.

wheel A with kthe driving;,frictioli-WheeliE, the latterpoisedt upon arocker-frame, I, and

. arranged to @he lisengage@V at pleasure by mechanism,situa-ted vin thecar X', substafin* iiuliy as descrbed'aud shown.

'1. The iloulile-grooved conical frction-piu- I ,Wheel and'fdrum A',the; lever D, provided :with a friction-brake, Dl

descending-,thebrake'DlL f December, 187,3.

ions E E', of differentf'ldiuumzaf.21'?,y the stationary shaft 'i',-andfalldrng-g-loosely'-: lougitudin'ally-,therwm so that' eitherthepmthe V-grooyedfzvliitng-yheahf'fbyfhein i backward orforwlfn theshafqfor poseof giving Vdifferent v'elocitiea-I wheel A, substantiallyas and.` for th set forth.

3., In. combination Hwiththe'friction-litlurl wir l' vthe c stop,tml)atantially 'Ide-M' posesahown;

have-hereuntosetfna y' an 4 gradually fstpped' by'the yfriietion-lnaker, or case of accident, Ytlxewvhweel mayfbe vinstantlychecked -by l f l 1

